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[目的]为提高AZ91D镁合金的耐腐蚀性能，研究在其表面构建微弧氧化/层状双金属氢氧化物(MAO/Mg–Al LDH)复合涂层的可行性及防护效果。[方法]先对AZ91D镁合金进行微弧氧化处理，然后采用水热法在MAO涂层上原位生成Mg–Al LDH涂层。通过X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(SEM)和能谱仪(EDS)表征复合涂层的物相组成、化学结构与微观形貌，通过动电位极化曲线与电化学阻抗谱测试检测其耐蚀性。[结果]MAO/Mg–Al LDH复合涂层表面呈均匀致密的纳米片状结构，对MAO涂层的微孔和裂纹起到很好的封闭作用。与MAO涂层相比，复合涂层的腐蚀电位正移100 mV，腐蚀电流密度降低近1个数量级，总阻抗提高23.5倍，表现出更优异的耐腐蚀性能。[结论]本工艺制备的MAO/Mg–Al LDH复合涂层能够显著提升基体的腐蚀防护能力，这为镁合金表面防护提供了有效的技术途径。
Abstract：[Objective] This study aims to enhance the corrosion resistance of AZ91D magnesium alloy by preparing a micro-arc oxidation/layered double hydroxide(MAO/Mg–Al LDH) composite coating on its surface, and to investigate its feasibility and protective performance. [Method] The AZ91D magnesium alloy was firstly subjected to micro-arc oxidation(MAO), followed by the in-situ growth of an Mg–Al LDH coating on the MAO film via hydrothermal method. The phase composition, chemical structure, and microstructure of the composite coating were characterized by X-ray diffraction(XRD), Fourier-transform infrared spectroscopy(FT-IR), scanning electron microscopy(SEM), and energydispersive spectroscopy(EDS). The corrosion resistance of MAO/Mg–Al LDH composite coating was evaluated through potentiodynamic polarization measurement and electrochemical impedance spectroscopy(EIS). [Result] The MAO/Mg–Al LDH composite coating exhibited a uniform and compact nanosheet-like structure, which effectively sealed the micropores and microcracks in the MAO coating. Compared to the single MAO coating, the composite coating showed a positive shift of 100 mV in corrosion potential, a nearly one-order-of-magnitude reduction in corrosion current density, and a 23.5-fold increase in total impedance, demonstrating significantly superior corrosion resistance. [Conclusion] The MAO/Mg–Al LDH composite coating prepared by this process significantly enhances the corrosion protection of the substrate, providing an effective technical approach for surface protection of magnesium alloys.
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基本信息:
DOI：10.19289/j.1004-227x.2026.01.005
中图分类号:TG174.4
引用信息:
[1]徐丽萍,胡胜波,毛杰.AZ91D镁合金表面MAO/Mg–Al LDH复合涂层的结构及性能研究[J].电镀与涂饰,2026,45(01):28-35.DOI:10.19289/j.1004-227x.2026.01.005.
基金信息:
广东省重点领域研发计划项目(2020B010186002)